Designation:F2446−04(Reapproved2010)AnAmericanNationalStandardStandardClassificationforHierarchyofEquipmentIdentifiersandBoundariesforReliability,Availability,andMaintainability(RAM)PerformanceDataExchange1ThisstandardisissuedunderthefixeddesignationF2446;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisclassificationistoserveasaninternationalstan-dardformarineequipmentnomenclature,taxonomy,hierarchi-caldatastructure,uniqueidentifiers,andboundarydefinitionfortheconsistentacquisitionandexchangeofequipmentRAMperformancedata.Thestandardaddressestheclassificationofmechanicalandsoftwareproducts.1.2RAMinanacronymforReliability,Availability,&Maintainabilitywhere:1.2.1Reliabilityistheprobabilitythatanitemcanperformarequiredfunctionundergivenconditionsforagiventimeinterval(t1,t2).Itisgenerallyassumedthattheitemisinastatetoperformthisrequiredfunctionatthebeginningofthetimeinterval.1.2.2Availabilityistheprobabilitythatanitemisinastatetoperformarequiredfunctionundergivenconditionsatagiveninstantoftime,assumingthattherequiredexternalresourcesareprovided.1.2.3Maintainabilityistheprobabilitythatagivenactivemaintenanceaction,foranitemundergivenconditionsofusecanbecarriedoutwithinastatedtimeinterval,whenthemaintenanceisperformedunderstatedconditionsandusingstatedproceduresandresources.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatoryrequirementspriortouse.2.ReferencedDocuments2.1ISOStandards:2ISO3166-1:1997,CodesfortheRepresentationofNamesofCountriesandTheirSubdivisions—Part1:CountryCodes,1997ISO10303,IndustrialAutomationSystemsandIntegration—ProductDataRepresentationandExchangeISO13584,Indu...
